Abstract
BM Ori is an eclipsing binary star in which a remarkable change in the shape of the light curve - especially the main minimum - was observed over the course of only a few years between 1968 and 2011. This paper focuses particularly on the primary minimum of November 10/11, 2025. A constant phase in the primary minimum was no longer observed: corresponding to “d” ≤ 0.01 [d]. Together with minima previously observed (December 2024 and all 2025 data), a delay of approximately 40 ± 20 minutes for the minimum now appears certain. This results in new instantaneous (heliocentric) elements: E0 = 2460990.483 ± 0.015 and P = 6.470559 ± 0.000007 [d].
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During his stay in 2018 on Hakos IAS member Patrick Ditz made measurements of the sky quality with the Unihedron SQM device.
The following diagrams show with quantitave data the impressive dark skies at the IAS observatory Hakos. Including the visual remarkable phenomenon that it gets darker when the Milky Way sets.
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